You CANNOT mass assign homerooms in summer environment because there's no update option for 'summer school demographics.'
Technology can upload this information if you provide an excel file with student ID and homeroom number.]
(Technology dept instructions: In summer environment,
Administration -> Utilities -> Upload file (This copies your csv file from your PC to eschool directory. Name file "sshroom.csv")
Administration -> Utilities -> Upload/Download -> Select "hross" interface ID.
Run upload - update existing records - verify first - check log - then run upload